Supported rides can be great!. If you can ride 10 miles w/o being bushed, you can do a 40 mile supported ride. Stop at the rest stops and enjoy the eats. Maybe you'll find some congenial folks riding your speed to share the fun. I'd suggest you start toward the back and let the fast folks and squirrels get out of your way. Take some pics. Thank the people operating the rest stops. Let us know how it goes.
